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2004 TrailBlazer no low beam headlamps? - TrailBlazer Chevrolet Cars & Trucks

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The selector switch on the left stick on the steering column has issues in those trucks. That is the problem. Replace it or just order a column from the junk yard with a key and swap the cylinder and replace the column

Posted on Dec 31, 2010

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Posted on Jan 02, 2017

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Dim on headlight not working, changed fuse,bulb,relay 15016745,and bulb connector,still want work-2002 trailblazer


Low beam's don't work , how about high beams . Low beam relay is turned on by the BCM - body control module , headlamp switch is a input to the BCM . Your best bet mite be to take it to a qualified repair shop , rather then guessing an replacing parts you don't need . Hooking up a scan tool an checking for DTC'S - diagnostic trouble codes should have been the first step before replacing parts .
The headlamp driver module (HDM) is an electronic module that provides electrical power to the vehicle low beam headlamps. The HDM is controlled by a pulse width modulated (PWM) ground signal from the body control module (BCM). The BCM determines the desired lamp intensity using the ambient light sensor, multifunction switch , wiper motor, and the park brake switch as inputs. In general, the HDM will operate in one of three modes:
• Reduced Intensity Mode: This mode is used by features that do not require or allow maximum low beam headlamp intensity such as daytime running lights (DRL) (nominal: 81% duty cycle).
• Full Intensity Mode: This mode is used by features that require full low beam headlamp intensity such as low beam headlamp operation in manual, wiper activated headlamp (WAH), or auto modes (nominal: 100% duty cycle).
• Off Mode: This is the default mode of the system that will occur when none of the features described above are active. The BCM will deactivate its PWM output (0% duty cycle) during this mode.

Chevy Trailblazer headlights don work HDM input output testing YouTube

Aug 27, 2017 | Cars & Trucks

1 Answer

What caused low beam to fail suddenly?


As far as voltage, check the low beam fuse. Not only check the fuse, use a testlite and check voltage on the fuse circuit. With headlamp switch on and dimmer switch on low beam. See the relay that says headlamp driver module, that is for low beam.
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Apr 11, 2016 | 2003 Chevrolet TrailBlazer

1 Answer

2004 chevy trailblazer, Both low beam headlamps are out. Headlamps replaced(same problem). Fuses are good. High beams work fine.


There should be a relay for the low beams. Locate and replace, Or swap it with another relay to see if that fixes the problem.

Dec 27, 2010 | 2004 Chevrolet TrailBlazer

1 Answer

2004 Chevrolet TrailBlazer. Passenger front low beam headlamp out


FACE THE VEHICLE SO THAT BATTERY IS ON YOUR RIGHT;
2.REMOVE THE BLACK PLASTIC PIECE THAT RUNS OVER RADIATOR BETWEEN HOOD LATCH AND FAN. IT IS ABOUT 53 1/2" LONG AND HOLDS THE HOOD PROP CLIP. (3 PLASTIC PUSH RETAINERS & 2 SHEET METAL SCREWS);
3.REMOVE THE GRILL ASSEMBLY UNDERNEATH THE PIECE IN STEP 2 BY PUSHING DOWN FIRMLY ON 4 RETAINER CLIPS WHICH RUN ALONG THE TOP. USE A WIDE SLOT SCREWDRIVER. PULL UP GENTLY ON GRILL ASSEMBLY. IT WILL POP OUT. THE GRILL ASSEMBLY EXTENDS UNDER EACH HEADLIGHT ASSEMBLY (HA) AND IT DISPLAYS THE CHEVROLET LOGO IN THE MIDDLE. MY GRILL ASSEMBLY POPPED OUT EASILY AND ALL THE OTHER RETAINER CLIPS ON THE BOTTOM AND BENEATH AND TO THE SIDE OF HA WERE AUTOMATICALLY RELEASED WITHOUT ANY FUSS;
4.ON TOP OF HA SEE ONE TAB (ABOUT 1" LONG)ON THE RIGHT SIDE AND ONE ON THE LEFT (THE ONE ON L IS CLOSER TO THE FENDER);
5.PULLUPWARDDIRECTION ON TABS. THEY WILL SLIDE UPWARD A COUPLE OF INCHES AND WILL RELEASE THE HA WHICH YOU CAN THEN PULL OUT TOWARDS YOU;
6.AT BACK OF THE HA, REMOVE 2 ROUND RUBBER CAPS (ABOUT 4" IN DIAMETER)--ONE FOR LOW BEAM--ONE FOR HIGH. REVEAL BULBS. UNSNAP THE WIRE HARNESS FROM BULB BASE AND TURN BULB 1/4 TURN CLOCKWISE (REMEMBER YOU ARE FACING THE TRUCK)
7.REPLACE BULB(S). #9006 BULB IS GRAY-BASE, FOR HIGH BEAM ON OUTSIDE. #9005 IS BLACK-BASE, LOW BEAM TO INSIDE OF HIGH BEAM.
CHANGING HIGH AND LOW AND REASSEMBLY TOOK ABOUT HALF HOUR. GOOD LUCK. ALTERNATIVE: IF YOU ARE REPLACING THE PASSENGERSIDE HEADLIGHT JUST REMOVE THE AIR FILTER COVER AND PULL PLUG OUR FROM BEHIND HEADLIGHT AND REPLACE. BE CAREFUL HANDLING LIGHT BULB. TO CHANGE THE ONE ON THE DRIVER'S SIDE JUST REACH IN FRONT OF THE BATTERY TO ACCESS THE PLUG AND HEADLILGHT. TOOK ABOUT 5 MINUTES. ENJOY YOU TRAILBLAZER, GREAT TRUCK.

Feb 20, 2010 | 2004 Chevrolet TrailBlazer

1 Answer

How to change lowbeam headlight bulb on 02 chev trailblazer


  1. Open and support the hood.
  2. Remove the grille.
  3. Pull up on the retaining tabs in order to remove the headlamp assembly from the headlamp panel.
  4. Disconnect the headlamp leveling electrical connector from the motor/actuator if equipped.
  5. Disconnect the headlamp electrical connector from the headlamp assembly.
  6. Remove the side marker socket from the headlamp assembly.
  7. Remove the park/turn socket from the headlamp assembly.
  8. Remove the headlamp assembly from the headlamp panel.
  9. Remove the access cover from the rear of the headlamp.
  10. Disconnect the electrical connector from the socket.
  11. Rotate the bulb and socket counter clockwise in order to remove the bulb and socket from the housing.
  12. Disconnect the electrical connector from the socket.
  13. Remove the bulb and socket from the headlamp.
Replace the low beam bulb with another low beam bulb. The low beam bulb has a gray tip and a grey socket.


Oct 17, 2009 | Chevrolet TrailBlazer Cars & Trucks

1 Answer

How to change front headlamp bulb? Low beam


  1. Open the hood.
  2. Remove Grille.
  3. Remove the 2 retainers on back of headlamp assembly and remove the headlamp from the sheet metal panel.
  4. Remove the access cover from the rear of the headlamp.
  5. Disconnect the electrical connector from the socket.
  6. Rotate the bulb and socket counter clockwise in order to remove the bulb and socket from the housing.
  7. Disconnect the electrical connector from the socket.
  8. Remove the bulb and socket from the headlamp.
Installation Procedure Important: • Replace a high beam bulb with another high beam bulb. The high beam bulb has a black socket. • Replace a low beam bulb with another low beam bulb. The low beam bulb has a gray tip and a grey socket.

Oct 14, 2009 | 2002 Chevrolet TrailBlazer

2 Answers

Headlamps Out but High Beams still work?


Hi, it could be faulty relay, you could swap it with the high beam one to test. hope this helps

Aug 04, 2009 | 2004 Chevrolet TrailBlazer

1 Answer

2004 Lincoln Navigator Low Beam Bulb replacement


your owner manual will list the bulb. It is expensive. tascafordparts.com for discount from Ford Dealer

here's 2003, don't have 2004

Navigator high intensity discharge (HID) headlamp
  1. Remove the front radiator air deflector.
  1. Remove the three bolts and the headlamp assembly.
    • Disconnect the electrical connectors.
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8. Remove the headlamp bulb protective cover(s).
  • Remove the HID lamp cover.
  • Remove the high beam cover.
  • Disconnect the electrical connector and push the grommet into the headlamp assembly.
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  1. Release the spring tabs and remove the HID low beam bulb.
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Apr 11, 2009 | 2004 Lincoln Navigator

1 Answer

Low beam headlamps not working on my 2004 armada


Did you check in the engine compartment.
If you go to autozone or advanced auto parts you can get a book for the car for about 15 bucks

Dec 12, 2008 | 2004 Nissan Armada

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